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There is absolutely no incentive to divide... at all... ever. Reach a suitable size then wait for the enemy to divide and absorb them when theyre smaller, or just wait for them all to die from the viruses. So pretty flawed, but it's still fun.
Under rating threshold (hideshow)
Easy and simplistic. All you do is grow a bit then wait for the other microbes to split and eat them. The "bonuses" are pointless, except the spike, which speeds things up a little bit.